Sun writes: "It seems like PrimeSense (the chip producer behind the Kinect) have released an SDK to the general public. Some things, like the drivers, were completely open sourced, while others, like skeleton tracking, user extraction and hand tracking are available free of charge (Windows and Ubuntu 32 and 64 bit). The forum seems to aim at being hardware neutral, but the actual drivers available right now are only for the PrimeSense chip (but do work with the Kinect hardware, which is about 50$ cheaper than the reference implementation they sell on the site). There is also a video of skeleton tracking in action.